fuel flow
Along with cleaning the carb, make sure you have a good strong flow of fuel from the fuel line, before the it enters the carburetor. In having to partially block the throat, (basically running partially choked,) that indicates the starving for fuel. When you partially choke a carburetor, this creates more vacuum across the main jet an cases it to pull more fuel from the float bowl.
Now, with that said, as others have pointed out, this is why all the holes in the main jet tube must be clear.
I would double check the float level setting, and confirm good fuel flow to the carburetor.
__________________
Gary
1974 1650 50A "budscub" Was my fathers
1969 125 42"
1978 1450 44A dual hydraulics
1984 782 50C dual hydraulics, waiting for vanguard
Z-force Cub cadet Zero turn
Sears '66 Suburban 10 Sears '66 Suburban 12
2 Breaking plows, 2 disc's, front blade, rear blade, Sickle bar mower, 2 decks 3pt harrow
74 "Green 100 "John" 
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